Phase III Clinical Trial of Fentanyl Transdermal Matrix Patch, in the Management of Chronic Intractable Pain- Assessment of Effectiveness, Safety and Pharmacokinetics

Inclusion Criteria: * Patients with chronic intractable pain receiving any of the following treatments :(1)Codeine phosphate, (2)Morphine hydrochloride preparations equivalent to less than 315 mg/day of oral morphine, (3)Fentanyl citrate injectable solution equivalent to less than 0.3 mg/day * Patients with chronic intractable pain in whom lesions causative of pain cannot be removed or treated, or in whom pain has been persisting for at least 12 weeks despite of the existing medication * Patients may be hospitalized during application of the initial transdermal dose of fentanyl transdermal matrix patches (patients may be ambulatory when the study starts). Exclusion Criteria: * Patients with respiratory dysfunction such as chronic pulmonary disease * Patients with asthma * Patients with bradyarrhythmia * Patients with concurrent liver and/or kidney dysfunction according to the latest laboratory test values within 14 days before the start of the pre-treatment observation period * Patients with organic brain disorder such as elevated intracranial pressure, disturbance of consciousness/coma, or brain tumor * Patients with any psychoneurologic complication and judged incapable of self assessment * Patients with or with a history of drug dependency or narcotic abuse * Patients with a history of hypersensitivity to fentanyl or any other opioid analgesic